content: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2012, by Object Refinery Limited and Contributors.
   *
   * Project Info:  http://www.jfree.org/jfreechart/index.html
   *
   * This library is free software; you can redistribute it and/or modify it
   * under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation; either version 2.1 of the License, or
   * (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
   * License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
   * USA.
   *
   * [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
   * Other names may be trademarks of their respective owners.]
   *
   * -------------------
   * NumberTickUnit.java
   * -------------------
   * (C) Copyright 2001-2008, by Object Refinery Limited.
   *
   * Original Author:  David Gilbert (for Object Refinery Limited);
   * Contributor(s):   -;
   *
   * Changes
   * -------
   * 19-Dec-2001 : Added standard header (DG);
   * 01-May-2002 : Updated for changed to TickUnit class (DG);
   * 01-Oct-2002 : Fixed errors reported by Checkstyle (DG);
   * 08-Nov-2002 : Moved to new package com.jrefinery.chart.axis (DG);
   * 09-Jan-2002 : Added a new constructor (DG);
   * 26-Mar-2003 : Implemented Serializable (DG);
   * 05-Jul-2005 : Added equals() implementation (DG);
   * 05-Sep-2005 : Implemented hashCode(), thanks to Thomas Morgner (DG);
   * 02-Aug-2007 : Added new constructor with minorTickCount (DG);
   *
   */
  
  package org.jfree.chart.axis;
  
  import java.io.Serializable;
  import java.text.NumberFormat;
  
  /**
   * A numerical tick unit.
   */
  public class NumberTickUnit extends TickUnit implements Serializable {
  
      /** For serialization. */
      private static final long serialVersionUID = 3849459506627654442L;
  
      /** A formatter for the tick unit. */
      private NumberFormat formatter;
  
      /**
       * Creates a new number tick unit.
       *
       * @param size  the size of the tick unit.
       */
      public NumberTickUnit(double size) {
          this(size, NumberFormat.getNumberInstance());
      }
  
      /**
       * Creates a new number tick unit.
       *
       * @param size  the size of the tick unit.
       * @param formatter  a number formatter for the tick unit (<code>null</code>
       *                   not permitted).
       */
      public NumberTickUnit(double size, NumberFormat formatter) {
          super(size);
          if (formatter == null) {
              throw new IllegalArgumentException("Null 'formatter' argument.");
          }
          this.formatter = formatter;
      }
  
      /**
       * Creates a new number tick unit.
       *
       * @param size  the size of the tick unit.
       * @param formatter  a number formatter for the tick unit (<code>null</code>
       *                   not permitted).
       * @param minorTickCount  the number of minor ticks.
       *
       * @since 1.0.7
       */
      public NumberTickUnit(double size, NumberFormat formatter,
              int minorTickCount) {
          super(size, minorTickCount);
          if (formatter == null) {
              throw new IllegalArgumentException("Null 'formatter' argument.");
          }
          this.formatter = formatter;
      }
  
      /**
       * Converts a value to a string.
       *
       * @param value  the value.
       *
       * @return The formatted string.
       */
      @Override
      public String valueToString(double value) {
          return this.formatter.format(value);
      }
  
      /**
       * Tests this formatter for equality with an arbitrary object.
       *
       * @param obj  the object (<code>null</code> permitted).
       *
       * @return A boolean.
       */
      @Override
      public boolean equals(Object obj) {
          if (obj == this) {
              return true;
          }
          if (!(obj instanceof NumberTickUnit)) {
              return false;
          }
          if (!super.equals(obj)) {
              return false;
          }
          NumberTickUnit that = (NumberTickUnit) obj;
          if (!this.formatter.equals(that.formatter)) {
              return false;
          }
          return true;
      }
  
      /**
       * Returns a string representing this unit.
       *
       * @return A string.
       */
      @Override
      public String toString() {
          return "[size=" + this.valueToString(this.getSize()) + "]";
      }
  
      /**
       * Returns a hash code for this instance.
       *
       * @return A hash code.
       */
      @Override
      public int hashCode() {
          int result = super.hashCode();
          result = 29 * result + (this.formatter != null
                  ? this.formatter.hashCode() : 0);
          return result;
      }
  
  }
  